- Sensi ST55 Smart Thermostat
Trusted & Verified
Sensi ST55 Smart Thermostat, Wi-Fi, Alexa
- Control temperature settings through the Sensi mobile app
- Connects to a 2.4 GHz Wi-Fi home network
- Works with Alexa for compatible voice control
- Supports 7-day programmable scheduling
- Geofencing adapts settings around household routines
- Smart alerts provide HVAC-related notifications
- Tracks energy usage through connected reporting tools
- Displays and monitors indoor humidity
- ENERGY STAR certified for connected thermostat efficiency
- Traditional footprint helps reduce wall patching during replacement
Control home comfort from nearly anywhere with the Sensi ST55 Smart Thermostat. Built around a familiar thermostat layout, it adds Wi-Fi connectivity and app-based control without requiring homeowners to adapt to an unfamiliar interface. The Sensi app provides guided installation and remote temperature management, while support for Alexa adds convenient voice control. ENERGY STAR certification and built-in energy monitoring tools help homeowners make informed decisions about heating and cooling use.
Connected Comfort and Flexible Scheduling
Connect the thermostat to a 2.4 GHz Wi-Fi network to manage temperature settings from a compatible mobile device. Create a 7-day programmable schedule or use geofencing to adjust comfort settings around household routines. Smart alerts can notify users when Sensi detects certain heating or cooling issues, while monthly energy usage information provides additional visibility into HVAC operation.
Broad HVAC Compatibility
The ST55 supports single-stage, multistage, and heat pump configurations, including systems using gas, oil, electric heat, conventional air conditioning, boilers, and radiant heat. Most conventional combined heating and cooling installations do not require a common wire. A common wire is required for heat-only, cool-only, and heat pump systems, so existing wiring should be checked before installation.
The traditional footprint helps cover the area occupied by many existing thermostats, reducing the need for wall patching or painting. On-screen humidity monitoring, keypad lockout, app-based controls, and smart home integration add useful connected features while keeping everyday temperature adjustment straightforward.
General
Product:
| Product Type | Smart Thermostat |
| Model Series | ST55 |
| Display Type | LED |
| Dimensions | 5.880 inch L x 3.750 inch H x 1.000 inch D |
Connectivity and Controls:
| Wi-Fi Network | 2.4 GHz |
| Smart Home Compatibility | Amazon Alexa, Google Home, Samsung SmartThings |
| Program Options | 7 Day Programmable, Geofencing, Nonprogrammable |
| Smart Alerts | Supported |
| Energy Usage Monitoring | Supported |
| Humidity Monitoring | Supported |
| Keypad Lockout | Supported |
HVAC Compatibility:
| Single Stage | 1H/1C |
| Multistage | 2H/2C |
| Heat Pump | 4H/2C |
| Typical Applications | 3 Wire Zone Heat, Conventional Air Conditioning, Gas Heat, Oil Heat, Electric Heat, Heat Pump |
| Power Source | Power Sharing or Hardwire |
| Common Wire | Not Required for Most Conventional Combined Heating and Cooling Systems |
| Common Wire Requirement | Required for Heat Only, Cool Only, and Heat Pump Systems |
Electrical:
| Terminal Load Rating | 1.5 A Per Terminal, 2.5 A Maximum All Terminals Combined |
| Terminals | RC, RH, C, W/E, W2/*, Y, Y2/*, O/B/2, G, L |
Certifications:
| ENERGY STAR Certified | Yes |
| Title 24 Compliant | Yes |
Starting at $8.74/mo
Estimated over 12 months with Affirm, subject to eligibility and approval.
Flexible payment options available
Interest-free installments and monthly financing may be available through Shop Pay on eligible purchases.
Starting at $26.25
No interest if paid in full by the promotional terms. Minimum monthly payments required and subject to credit approval.
Shipping Policy
Orders of $25 or more qualify for free standard shipping on eligible items.
Most in-stock orders placed before 1 PM EST Monday–Thursday ship the same business day. View Shipping Policy
Free Local Pickup
Please call for store stock availability. Requests made before 2:30 PM EST can be available for next-day pickup. Learn more
Tab: Frequently Asked Questions
How do I return an item?
How do I return an item?
Returns are incredibly simple. Please log into your account, find your item you wish to return and follow the prompts to make a return. If you do not have an account, click here to find your order and make a return.
Will I receive a full refund when I return an item?
Will I receive a full refund when I return an item?
You will receive a full refund when you return an item in its original manufacturer’s packaging, undamaged and unmarked. If the item you are returning is priced at less than $35, you will be charged a 15% restocking fee. Please note you will not be refunded any shipping charges.
How many days do I have to make a return?
How many days do I have to make a return?
You have 30 days to make a return. During the holiday season, from November 1 to December 31, we extend the return window to 60 days.
My item was damaged in transit. How do I place a return?
My item was damaged in transit. How do I place a return?
If your order has been noticeably damaged in transit, we strongly recommend that you refuse delivery and notify us immediately. Claims for missing items or items damaged in transit must be made within 48 hours of delivery. If there is carrier damage, please contact support@focuscamera.com with your order number and a description of the damage.
There’s an issue with my order, what should I do?
There’s an issue with my order, what should I do?
Oh no! Please contact our customer service team so we can resolve the issue immediately. You can call us on 1.800.221.0828, email us at support@focuscamera.com, or send us a message here.
Can I exchange an item?
Can I exchange an item?
We do not currently offer exchanges. Please return the item you purchased within 30 days and order what you’d like instead.
If I ordered a kit, do I have to return all the items?
If I ordered a kit, do I have to return all the items?
If you ordered a kit, you must return all components and accessories to receive a full refund.
I ordered a product that included a free item. I’d like to return it, do I need to return the free item as well?
I ordered a product that included a free item. I’d like to return it, do I need to return the free item as well?
If you ordered a product that included a free item, you must include the free item with your return. If not, your return will not be accepted and you will not receive a full refund.
Do you offer repairs?
Do you offer repairs?
We currently only offer camera repairs at our Brooklyn store. The item must be dropped off and collected in person as we do not accept shipped items for repair. For more information, please call our Brooklyn store on 1.718.431.7900.
What is your return policy?
What is your return policy?
Most items can be returned within 30 days for a full refund. Click here to read our full return policy.
